PATCH: tests for MI commands

[Nick Roberts]

 > > I think that we should either remove them (my preference) or rewrite
 > > parts of GDB so that the different MI levels act as independent
 > > interpreters (which currently I am certainly not going to offer to do).
 > > If they were independent then clearly changing the behaviour of the
 > > current level, as I have just done, wouldn't break the tests for level 2.
 > 
 > Incorrect.  Please read again my description of how you broke the mi2
 > tests.  It has nothing to do with your changes to the MI output and
 > everything to do with your changes to the test cases.

Yes, you're right, I was too eager and my analysis is wrong for this case.  My
original point, that separate mi2 tests are not worthwhile, still stands,
however.

Nick